题目内容

But recent progress in genetic________has led some scientists to believe that the day is approaching.

A. engine
B. engineer
C. engineering
D. engineers

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Not everyone working in the field of genetics believes that parents will be_______such choices anytime soon.

A. make
B. making
C. made
D. maded

Why might some parents want to know the gender of their child before it is _______?

A. borning
B. born
C. burn
D. burning

The use of genetic engineering should be restricted______just those cases.

A. around
B. at
C. on
D. to

Reportedly, one scientist has even ______of using genetic engineering.

A. speak
B. speaking
C. spoken
D. spoke